Run Coverage build with Go1.18

Author: elgopher

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.17
+          go-version: 1.18
 
       - name: Test
         run: go test -v -coverprofile=coverage.txt -covermode=atomic ./...